WO2017151069A1

WO2017151069A1 - Vehicle body floor structure

Info

Publication number: WO2017151069A1
Application number: PCT/TH2016/000019
Authority: WO
Inventors: Naoyuki Tamura; Bodin KANCHANA-AMPOL
Original assignee: Asian Honda Motor Co., Ltd.
Priority date: 2016-03-04
Filing date: 2016-03-04
Publication date: 2017-09-08

Abstract

A vehicle body floor structure (11) includes: side sills (13 A, 13B); a floor panel (17) having a side end part (31) that is aligned at a lower wall (14c) of the side sill (13A (13B)); and a floor cross member (19) that extends in a vehicle width direction between lateral walls of the side sills (13A, 13B). The floor cross member (19) has an upper part (45) having a top wall (5 1) that is aligned at an upper wall (14b) of the side sill (13A (13B)) and a lower part (46) that is joined to the floor panel (17). The lower part (46) has a notch (68) adjacent to the side sill (13A (13B)). The floor panel (17) has a depressed part (32) adjacent to the side sill (13A (13B)). A partition space (91) through which a harness (90) passes is formed by the notch (68), the depressed part (32), and the lateral wall (14a) of the side sill (13A (13B)).

Description

VEHICLE BODY FLOOR STRUCTURE

TECHNICAL FIELD

[0001 ]

The present invention relates to a vehicle body structure in a vehicle such as a passenger vehicle and specifically relates to a vehicle body floor structure.

BACKGROUND

[0002]

Japanese Unexamined Patent Application, First Publication No. H5-262264 discloses a technique in which a space through which a harness passes is formed between a side sill and a reinforcement member that extends along the side sill.

[0003]

Japanese Unexamined Patent Application, First Publication No. H5-155358 discloses a technique in which a space through which a harness passes is formed between a side sill and a floor panel.

SUMMARY OF INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004]

An object of an aspect of the present invention is to provide a vehicle body floor structure suitable for weight saving. MEANS FOR SOLVING THE PROBLEM

[0005]

A vehicle body floor structure according to an aspect of the present invention includes: side sills; a floor panel having a side end part that is aligned at a lower wall of the side sill; and a floor cross member that extends in a vehicle width direction between lateral walls of the side sills. The floor cross member has an upper part having a top wall that is aligned at an upper wall of the side sill and a lower part that is joined to the floor panel. The lower part has a notch adjacent to the side sill. The floor panel has a depressed part adjacent to the side sill. A partition space through which a harness passes is formed by the notch, the depressed part, and the lateral wall of the side sill.

[0006]

In the vehicle body floor structure described above, the floor cross member can have a step profile including a frontward step and a rearward step. The step profile can have at least one outer ridge line and at least one inner ridge line.

[0007]

In the vehicle body floor structure described above, the upper part of the floor cross member can have an overhang portion that is joined to the upper wall of the side sill and a bend portion that is joined to the lateral wall of the side sill. At least part of the overhang portion and the bend portion can be formed so as to continue to a step part in the step profile.

[0008]

In the vehicle body floor structure described above, the notch of the floor cross member can have a first tilt part. The depressed part of the floor panel can have a second tilt part. The first tilt part and the second tilt part can be provided such that an interval between the first tilt part and the second tilt part increases toward an outside in the vehicle width direction.

[0009]

In the vehicle body floor structure described above, the floor panel can have a tunnel part that extends in a front-to-rear direction at a center position in the vehicle width direction. The floor cross member can include reinforcement members that are arranged inside the tunnel part and extend in the vehicle width direction.

[0010]

In the vehicle body floor structure described above, the floor panel can have bead-shaped ribs that protrude upward. The floor cross member can be joined to the floor panel at least at the bead-shaped ribs.

[0011]

In the vehicle body floor structure described above, the floor cross member can have joint seating surfaces that protrude toward the floor panel.

[0012]

In the vehicle body floor structure described above, the side sill can have, as a joint part with a center pillar, a first joint part in the upper wall, a second joint part in the lateral wall, and a corner part provided between the first joint part and the second joint part. The first joint part, the corner part, and the second joint part can be continuously provided.

[0013]

The vehicle body floor structure described above can further include side sill extensions and tunnel part extensions. The side sill extensions, the tunnel part extensions, and the floor cross member can form triangular frame structures each of which having a substantially triangular shape.

ADVANTAGE OF THE INVENTION

[0014]

According to an aspect of the present invention, a vehicle body floor structure suitable for weight saving and arrangement of a harness is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015]

FIG. 1 is a perspective view of a vehicle body floor structure seen from the upside.

FIG. 2 is a perspective view showing the vicinity of a side sill and a center pillar.

FIG. 3 is a schematic cross-sectional view showing a joint structure of a floor cross member and the side sill.

FIG. 4 is a cross-sectional view showing the floor cross member and the side sill.

FIG. 5 is a view showing a cross-sectional profile of the floor cross member.

FIG. 6 is an enlarged perspective view showing a joint part of the floor cross member and the side sill.

FIG. 7 is a schematic cross-sectional view showing a joint structure of the floor cross member and a floor panel.

FIG. 8 is an enlarged perspective view showing a tunnel part of the floor panel.

DESCRIPTION OF THE EMBODIMENTS

[0016]

Hereinafter, embodiments of the present invention will be described based on the drawings. In the following descriptions, a vertical direction corresponds to a vertical direction of a vehicle body. A front-to-rear direction corresponds to a front-to-rear direction of a vehicle body. A vehicle width direction (right-to-left direction) corresponds to a vehicle width direction (right-to-left direction) of a vehicle body. Further, descriptions of one of right and left sides can be applicable similarly to the other side.

[0017]

In one embodiment, a floor structure 11 of a vehicle body 10 is applicable to vehicle bodies of various passenger vehicles such as a small-size vehicle, a medium-size vehicle, a large-size vehicle, a sedan, and a wagon.

[0018]

As shown in FIG. 1 , a vehicle body floor structure 11 includes side sills 13 A,

13B, a floor panel 17, and a floor cross member 19.

[0019]

The side sill 13 A is arranged on the right side of the vehicle body 10 and extends at least in the front-to-rear direction of the vehicle body 10. The side sill 13B is arranged on the left side of the vehicle body 10 and extends at least in the front-to-rear direction of the vehicle body 10. The floor panel 17 is a plate member that is stretched between the side sills 13A, 13B and is provided to extend at least in the vehicle width direction and the front-to-rear direction.

[0020]

The floor panel 17 has a tunnel part (floor tunnel) 18 that extends in the front-to-rear direction in the vicinity of the center in the vehicle width direction of the vehicle body 10. The tunnel part 18 is a part that protrudes in a vehicle room direction (upward) from the floor panel 17. In an example, the center axis of the tunnel part 18 is arranged at the center in the vehicle width direction of the vehicle body 10.

[0021]

In the example of FIG. 1 , the floor cross member 19 has a divided structure that includes a floor cross member (right floor cross member) 19A and a floor cross member (left floor cross member) 19B. In another example, the floor cross member 19 can be an integrated structure that passes through the tunnel part 18.

[0022]

In the example of FIG. 1 , the floor structure 1 1 has a right substantially triangular frame (substantially triangular frame structure) 21 A. The floor structure 11 has a left substantially triangular frame (substantially triangular frame structure) 21B. The floor structure 11 includes side sill extensions 24A, 24B and tunnel part extensions 25A, 25B, which are provided rearward of a front side frame and the like. The side sill extension 24A, the tunnel part extension 25 A, and the floor cross member 19 (19A) form a triangular frame (triangular frame structure) having a substantially triangular shape below a front seat. The side sill extension 24B, the tunnel part extension 25B, and the floor cross member 19 (1 B) form, below the front seat, a triangular frame (triangular frame structure) having a substantially triangular shape in plan view.

[0023]

As shown in FIG. 2, the side sill 13A has a side sill inner 14 provided on the vehicle room side and a side sill outer 15 provided outside. The side sill inner 14 has a cross-sectional profile having a hat-shaped profile (substantially a U-shaped profile). The side sill outer 15 has a cross-sectional profile having a hat-shaped profile

(substantially a U-shaped profile).

[0024]

The side sill inner 14 is configured by a plate member having a bend structure.

The side sill inner 14 has a lateral wall 14a, an upper wall 14b, a lower wall 14c, an upper edge flange 14d, and a lower edge flange 14e. In the side sill inner 14, the lateral wall 14a has a lateral surface that is arranged to face the vehicle room and extends in the front-to-rear direction and the vertical direction. The upper wall 14b has an upper surface that is arranged to face upward and extends in the front-to-rear direction and the vehicle width direction. The lower wall 14c has a lower surface that is arranged to face downward and extends in the front-to-rear direction and the vehicle width direction. The upper wall 14b is arranged between the lateral wall 14a and the upper edge flange 14d. The lower wall 14c is arranged between the lateral wall 14a and the lower edge flange 14e. One or more of an angle, a corner, and a curved corner can be provided between the adjacent two walls.

[0025]

The side sill outer 15 is configured by a plate member having a bend structure. The side sill outer 15 has a lateral wall 15a, an upper wall 15b, a lower wall 15c, an upper edge flange 15d, and a lower edge flange 15e. In the side sill outer 15, the lateral wall 15a has: lateral surfaces (first lateral surface 15aa, second lateral surface 15ab) that are arranged to face outward and extend in the front-to-rear direction and the vertical direction; and a step part (bend part) 15ac provided between the first lateral surface 15aa and the second lateral surface 15ab. The step part 15ac is provided to extend at least in the front-to-rear direction.

[0026]

In the side sill outer 15, the upper wall 15b has an upper surface that is arranged to face upward and extends in the front-to-rear direction and the vehicle width direction. The lower wall 15c has a lower surface that is arranged to face downward and extends in the front-to-rear direction and the vehicle width direction. The upper wall 15b is arranged between the lateral wall 15a and the upper edge flange 15d. The lower wall 15c is arranged between the lateral wall 15a and the lower edge flange 15e. One or more of an angle, a corner, and a curved corner can be provided between the adjacent two walls.

[0027]

The upper edge flange 14d of the side sill inner 14 and the upper edge flange 15d of the side sill outer 15 are joined to each other. The lower edge flange 14e of the side sill inner 14 and the lower edge flange 15e of the side sill outer 15 are joined to each other. An inner space surrounded by the side sill inner 14 and the side sill outer 15 is provided.

[0028]

In an example, the side sill 13 has, as a joint part with a center pillar 16A (16), a first joint part 14ba provided at the upper wall 14b of the side sill inner 14, a second joint part 14aa provided at the lateral wall 14a, and a corner part 14za provided between the first joint part 14ba and the second joint part 14aa. The first joint part 14ba, the corner part 14za, and the second joint part 14aa are continuously provided. An angle is provided between the outer surface of the first joint part 14ba and the outer surface of the second joint part 14aa. Part of the center pillar 16A is joined closely to the first joint part 14ba of the upper wall 14b. Another part of the center pillar 16A is joined closely to the second joint part 14aa of the lateral wall 14a. The joint part of the center pillar 16 with respect to the side sill inner 14 continues from the upper wall 14b to the lateral wall 14a of the side sill inner 14.

[0029]

A partition space 91 through which a harness 90 passes is provided in the vicinity of the joint part of the side sill 13 A and the floor cross member 19A (19). The partition space 1 is provided to be surrounded by part of the side sill 13 A, part of the floor cross member 19A, and part of the floor panel 17.

[0030]

As shown in FIG. 3, the floor panel 17 has a side end part 31. The side end part 3 1 is aligned at the lower wall 14c of the side sill 13 A such that a load with respect to the side sill 13 A is transmitted to the floor panel 17. The side end part 31 of the floor panel 17 is provided to extend in the front-to-rear direction along the lower wall 14c of the side sill 13 A. At least part of the floor panel 17 at the side end part 31 has substantially the same height level as or a similar height level to the lower wall 14c of the side sill 13A.

[0031]

The floor panel 17 has a depressed part (groove portion) 32 adjacent to the side sill 13 A. The floor panel 17 has, in the vicinity of the side sill 13 A, a tilt part (second tilt part) 33 and a bottom part 34 that is provided between the tilt part 33 and the side sill 13 A. The tilt part 33 is provided to extend diagonally downward toward the side sill 13A and has a tilted upper surface that is tilted with respect to the horizontal plane. The depressed part 32 is formed with respect to the upper surface of the floor panel 17 by the tilt part 33 and the bottom part 34. The depressed part 32 is provided to extend at least partially in the front-to-rear direction.

[0032]

As shown in FIG. 4, the cross-section of the tunnel part 18 of the floor panel 17 has a U-shaped profile. The tunnel part 18 has: a top wall 41 having a top surface that is arranged substantially horizontally; and lateral walls 42, 43 adjacent to the top wall 41. The lateral wall 42 has a tilted surface facing laterally outward at one side in the vehicle width direction. The lateral wall 43 has a tilted surface facing laterally outward at another side in the vehicle width direction. In the vehicle width direction, the top wall 41 is arranged between the lateral wall 42 and the lateral wall 43. One or more of an angle, a corner, and a curved corner can be provided between the adjacent two walls.

[0033]

The floor cross member 19A extends in the vehicle width direction and bridges a gap between the side sill 13 A and the lateral wall 42 of the tunnel part 18. The floor cross member 19B extends in the vehicle width direction and bridges a gap between the side sill 13B and the lateral wall 43. The floor cross members 19 A, 19B each have a step structure and have an upper part 45 as a load transmission part and a lower part 46 as a floor joint part. [0.034]

As shown in FIG. 5, the floor cross member 19A has a step profile including a frontward step 48 provided relatively frontward and a rearward step 49 provided relatively rearward in the front -to-rear direction. In the step profile of the floor cross member 19A, the length (width) of the upper part 45 in the front-to-rear direction is smaller than the length (width) of the lower part 46. In an example, the step profile can have at least one outer ridge line and at least one inner ridge line. In another example, the step profile can have at least two outer ridge lines and at least two inner ridge lines. In still another example, the step profile can have at least four outer ridge lines and at least two inner ridge lines.

[0035]

The upper part 45 of the floor cross member 19A has: a top wall 51 having a top surface; and lateral walls 52, 53 adjacent to the top wall 51. The lateral wall 52 has a lateral surface arranged to face frontward. The lateral wall 53 has a lateral surface arranged to face rearward. In the front-to-rear direction, the top wall 51 is arranged between the lateral wall 52 and the lateral wall 53. One or more of an angle, a corner, and a curved corner can be provided between the adjacent two walls.

[0036]

The lower part 46 of the floor cross member 19A has middle walls 54, 55 having an upper surface, a lateral wall 56 adjacent to the middle wall 54, a lateral wall 57 adjacent to the middle wall 55, and flanges 58, 59 as a floor joint part. The lateral wall 56 has a lateral surface arranged to face frontward. The lateral wall 57 has a lateral surface arranged to face rearward. One or more of an angle, a corner, and a curved corner can be provided between the adjacent two walls.

[0037]

The middle wall 54 has one end arranged adjacent to the lateral wall 52 of the upper part 45 and the other end arranged adjacent to the lateral wall 56 of the lower part 46. The middle wall 55 has one end arranged adjacent to the lateral wall 53 of the upper part 45 and the other end arranged adjacent to the lateral wall 57 of the lower part 46. An angle that protrudes inward is provided between the lateral wall 52 and the middle wall 54, and an inner ridge line 61 that faces an inner space is formed at the apex of the angle. An angle that protrudes inward is provided between the lateral wall 53 and the middle wall 55, and an inner ridge line 62 that faces the inner space is formed at the apex of the angle. The inner ridge lines 61 , 62 can each extend continuously over substantially the whole region of the floor cross member 19A in the axial direction of the floor cross member 19A.

[0038]

An angle that protrudes outward is provided between the top wall 51 and the lateral wall 52, and an outer ridge line 63 that faces an outer space is formed at the apex of the angle. An angle that protrudes outward is provided between the top wall 51 and the lateral wall 53, and an outer ridge line 64 that faces the outer space is formed at the apex of the angle. The outer ridge lines 63, 64 can each extend continuously over substantially the whole region of the floor cross member 19A in the axial direction of the floor cross member 19A. An angle that protrudes outward is provided between the middle wall 54 and the lateral wall 56, and an outer ridge line 65 that faces an outer space is formed at the apex of the angle. An angle that protrudes outward is provided between the middle wall 55 and the lateral wall 57, and an outer ridge line 66 that faces the outer space is formed at the apex of the angle. The outer ridge lines 65, 66 can each extend continuously over substantially the whole region of the floor cross member 19A in the axial direction of the floor cross member 19A.

[0039]

As shown in FIG. 6, an end part of the top wall 51 of the floor cross member 1 9A is aligned at the upper wall 14b of the side sill 13 A such that a load with respect to the side sill 13A is transmitted to the floor cross member 19A. The end part of the top wall 51 of the floor cross member 19A is provided to extend in the front-to-rear direction along the upper wall 14b of the side sill 13A. At least part of the top wall 51 of the floor cross member 19A has substantially the same height level as or a similar height level to the upper wall 14b of the side sill 13 A.

[0040]

The floor cross member 19A has an overhang portion 5 1 a provided to extend from an end of the top wall 5 1. The overhang portion 51 a is provided to extend in the vehicle width direction from the end part of the top wall 51 as the extension of the top wall 51 . In the floor cross member I 9A, the overhang portion 51 a has an upper surface provided continuously with respect to the top surface of the top wall 51. At least part of the overhang portion 51 a is joined to the upper wall 14b of the side sill 13 A.

[0041 ] The floor cross member 19A has a bend portion 52a provided to extend from an end of the lateral wall 52. The floor cross member 19A has a bend portion 53a provided to extend from the end of the lateral wall 53. The bend portion 52a has a bend structure as a bent extension of the lateral wall 52 and the middle wall 54, and part of the bend structure faces the lateral wall 14a of the side sill 13 A. The bend portion 53a has a bend structure as a bent extension of the lateral wall 53 and the middle wall 55, and part of the bend structure faces the lateral wall 14a of the side sill 13 A. In the floor cross member 19A, the bend portion 52a has surfaces provided continuously with respect to a lateral surface of the lateral wall 52. In the floor cross member 19A, the bend portion 53 a has surfaces provided continuously with respect to a lateral surface of the lateral wall 53. At least part of the surfaces of the bend portion 52a is provided continuously also with respect to an upper surface of the middle wall 54. At least part of the surfaces of the bend portion 53a is provided continuously also with respect to an upper surface of the middle wall 55. At least part of the bend portion 52a is joined to the lateral wall 14a of the side sill 13A. At least part of the bend portion 53a is joined to the lateral wall 14a of the side sill 13 A.

[0042]

At least part of the overhang portion 51 a and bend portions 52a, 53a each having a joint part with the side sill 13 A is provided to continue to a step part of the floor cross member 19A. In other words, the top wall 51 that communicates with the overhang portion 51a and the lateral wall 52 that communicates with the bend portion 52a are arranged to have an angle therebetween, and a corner having the outer ridge line 63 is provided at the floor cross member 19 A. The top wall 51 that communicates with the overhang portion 51a and the lateral wall 53 that communicates with the bend portion 53a are arranged to have an angle therebetween, and a corner having the outer ridge line 64 is provided at the floor cross member 19A. The lateral wall 52 that communicates with the bend portion 52a and the middle wall 54 are arranged to have an angle therebetween, and a corner having the inner ridge line 61 is provided at the floor cross member 19A. The lateral wall 53 that communicates with the bend portion 53a and the middle wall 55 are arranged to have an angle therebetween, and a corner having the inner ridge line 62 is provided at the floor cross member 19A.

[0043]

In FIG. 6, as described above, the partition space 91 through which a harness passes is provided in the vicinity of the side sill 13 A. The floor cross member 19A has, at an end part in the vehicle width direction, a notch 68 adjacent to the side sill 13 A. The partition space 91 is formed to be surrounded by the notch 68 of the floor cross member 19 A, the depressed part 32 of the floor panel 17, and the lateral wall 14a of the side sill 13 A. In an example, the notch 68 is provided at part of an end portion of the lower part 46 of the floor cross member 19A and has a tilt part (first tilt part) 68a and a cap part 68b provided between the tilt part 68a and the side sill 13 A. The tilt part 68a is provided to extend diagonally upward toward the side sill 13 A and has a tilted lower surface that is tilted with respect to the horizontal plane. In the floor cross member 19A, a flange 68e is provided to continue to the flange 59 (58) of the lower part 46 along the tilt part 68a of the notch 68. Further, a flange 68f is provided to continue to the middle wall 55 (54) or to form part of the middle wall 55 (54) along the cap part 68b of the notch 68. The tilt part (first tilt part) 68a of the floor cross member 19 and the tilt part (second tilt part) 33 of the floor panel 17 are provided such that the interval between the tilt part 68a and the tilt part 33 increases toward the outside in the vehicle width direction.

[0044]

As shown in FIG. 7, the floor cross member 19A has joint seating surfaces (local projections) 71 that protrude toward the floor panel 17. In an example, the joint seating surfaces 71 can be provided by forming concave portions on the upper surface of the flange 59 (58) of the floor cross member 19A. The joint seating surfaces 71 are arranged at a lower position with respect to another surface of the floor cross member 19 A. The floor panel 17 has bead-shaped ribs (local projections) 35 provided to protrude upward. In an example, the bead-shaped ribs 35 can be provided by forming concave portions on the lower surface of the floor panel 17. Top parts of the

bead-shaped ribs 35 are arranged at an upper position with respect to another surface of the floor panel 17. The joint seating surfaces 71 and the bead-shaped ribs 35 are joined to each other. A gap (space) is formed between the adjacent bead-shaped ribs 35.

[0045]

As shown in FIG. 8, the floor cross member 19 is arranged inside the tunnel part 18 of the floor panel 17 and has reinforcement members 75, 76 that extend in the vehicle width direction. The reinforcement member 75 is arranged at substantially the same position in the front-to-rear direction as the lateral wall 52 on the frontward side of the upper part 45 in the floor cross member 19A (19B). The reinforcement member 76 is arranged at substantially the same position in the front-to-rear direction as the lateral wall 53 on the rearward side of the upper part 45 in the floor cross member 19A (19B). At least part of the reinforcement member 75 is joined to an inner surface of the tunnel part 18. At least part of the reinforcement member 76 is joined to an inner surface of the tunnel part 18. In an example, a cross-section formed by the reinforcement member 75, the top wall 41 of the tunnel part 18, and the reinforcement member 76 can have a cross- sectional profile similar to a cross-sectional profile formed by the lateral wall 52, the top wall 51 , and the lateral wall 53 of the floor cross member 19 A. In other words, the floor cross member 19 can have a cross-sectional profile that is substantially continued over the whole region in the vehicle width direction.

[0046]

The vehicle body floor structure 11 described above has a variety of features. As described below, the features can provide advantages.

[0047]

The vehicle body floor structure 11 includes: the side sills 13 A, 13B; the floor panel 1 having the side end part 31 that is aligned at the lower wall 14c of the side sill 13A (13B); and the floor cross member 19 that extends in the vehicle width direction between the lateral walls of the side sills 13 A, 13B. The floor cross member 19 has the upper part (load transmission part) 45 having the top wall 51 that is aligned at the upper wall 14b of the side sill 13 A (13B) and the lower part (floor joint part) 46 that is joined to the floor panel 17. The lower part 46 has the notch 68 adjacent to the side sill 13 A (13B). The floor panel 17 has the depressed part 32 adjacent to the side sill 13A (13B). The partition space 91 through which the harness 90 passes is formed by the notch 68, the depressed part 32, and the lateral wall 14a of the side sill 13 A (13B).

[0048]

According to the vehicle body floor structure 11 , a relatively large space through which the harness 90 passes is formed in the vicinity of the side sills 13A, 13B.

Reinforcement members are reduced, and thereby weight saving of the vehicle body 10 is achieved while securing the strength or the rigidity (lateral impact performance) of the structure. The structure 1 1 can be applicable preferably to a vehicle body having a low floor such as a sedan since the floor panel 17 is aligned at the lower wall 14c of the side sill 13A (13B).

[0049] In the vehicle body floor structure 1 1 , the floor cross member 19 has a step profile including the frontward step 48 and the rearward step 49. The step profile has at least one of the outer ridge lines 63, 64, 65, 66 and at least one of the inner ridge lines 61 ,

62.

[0050]

According to the vehicle body floor structure 1 1 , the floor cross member 19 has a high load transmission performance due to the inner ridge lines 61 , 62 in addition to the outer ridge lines 63, 64, 65, 66. As a result, high strength or rigidity (lateral impact performance) is secured.

[0051]

In the vehicle body floor structure 11 , the upper part (load transmission part) 45 of the floor cross member 19 has the overhang portion 5 l a that is joined to the upper wall 14b of the side sill 13A ( 13B) and the bend portions 52a, 53 a that are joined to the lateral wall 14a of the side sill 13 A (13B). At least part of the overhang portion 5 l a and the bend portions 52a, 53a is formed so as to continue to the step part in the step profile.

[0052]

According to the vehicle body floor structure 1 1 , a lateral impact load is appropriately transmitted to the whole of the upper part 45 of the floor cross member 1 9.

[0053]

In the vehicle body floor structure 1 1 , the notch 68 of the floor cross member 19 has the first tilt part 68a. The depressed part 32 of the floor panel 17 has the second tilt part 33. The first tilt part 68a and the second tilt part 33 are provided such that the interval between the first tilt part 68a and the second tilt part 33 increases toward the outside in the vehicle width direction.

[0054]

According to the vehicle body floor structure 1 1 , a lateral impact load is appropriately transmitted to the whole of the floor cross member 19.

[0055]

In the vehicle body floor structure 1 1 , the floor panel 17 has the tunnel part 18 that extends in the front-to-rear direction at the center position in the vehicle width direction. The floor cross member 19 includes the reinforcement members 75, 76 that are arranged inside the tunnel part 18 and extend in the vehicle width direction.

[0056] According to the vehicle body floor structure 11, when the tunnel part 18 is provided at the floor panel 17, a load is appropriately transmitted from one of the side sills 13 A, 13B to the other via the reinforcement members 75, 76.

[0057]

In the vehicle body floor structure 11 , the floor panel 17 has the bead-shaped ribs 35 that protrude upward. The floor cross member 19 is joined to the floor panel 17 at least at the bead-shaped ribs 35.

[0058]

According to the vehicle body floor structure 11, the floor panel 17 has a high rigidity due to the bead-shaped ribs 35, and an oscillation noise is reduced. The floor cross member 19 is joined to the floor panel 17 via the bead-shaped rib 35 to thereby form a gap (space) between the adjacent bead-shaped ribs 35, and this is advantageous to reducing an oscillation noise. Fluid easily flows on the floor panel 17 via the gap. For example, an electrodeposition coating solution is easily discharged, or antirust painting inside a cross-section is easily performed.

[0059]

In the vehicle body floor structure 11, the floor cross member 19 has the joint seating surfaces 71 that protrude toward the floor panel 17.

[0060]

According to the vehicle body floor structure 11, a sufficient gap (space) is formed between the floor cross member 19 and the floor panel 17, and this is

advantageous to the reduction of an oscillation noise. Fluid easily flows on the floor panel 17 via the gap. For example, an electrodeposition coating solution is easily discharged, or antirust painting inside a cross-section is easily performed.

[0061]

In the vehicle body floor structure 1 1 , the side sill 13A (13B) has, as a joint part with the center pillar 16A (16), the first joint part 14ba in the upper wall 14b, the second joint part 14aa in the lateral wall 14a, and the corner part 14za provided between the first joint part 14ba and the second joint part 14aa. The first joint part 14ba, the corner part 14za, and the second joint part 14aa are continuously provided.

[0062]

The vehicle body floor structure 1 1 is advantageous for an enlargement of the cross-section of the center pillar 16A (16) and an improvement of the strength or the rigidity (lateral impact performance).

[0063]

The vehicle body floor structure 11 further includes the side sill extensions 24A, 24B and the tunnel part extensions 25 A, 25B. The side sill extensions 24 A, 24B, the tunnel part extensions 25 A, 25B, and the floor cross member 19 form the triangular frame structures 21 A, 21 B each of which having a substantially triangular shape.

[0064]

According to the vehicle body floor structure 11, even when the depressed part 32 is formed in the floor panel 17, a front impact load is distributed to the side sills 13 A, 13B and the tunnel part 18 of the floor panel 17. Further, a lateral impact load is distributed to the front side frame and the floor cross member 19. As a result, vehicle body deformation around the front seat is prevented.

DESCRIPTION OF THE REFERENCE SYMBOLS

[0065]

10: vehicle body

11 : vehicle body floor structure

13 A, 13B: side sill

14: side sill inner

14a: lateral wall

14b: upper wall

14c: lower wall

14ba: first joint part

14aa: second joint part

14za: corner part

15 : side sill outer

16, 16A, 16B: center pillar

17: floor panel

18: tunnel part

19: floor cross member

19A: right floor cross member

19B: left floor cross member

21 A, 2 IB: triangular frame (triangular frame structure) A, 24B : side sill extension A, 25B: tunnel part extension : side end part

: depressed part

: tilt part (second tilt part): bead-shaped rib

: top wall

, 43 : lateral wall

: upper part

: lower part

: frontward step

: rearward step

: top wall

a: overhang portion

: lateral wall

a, 53a: bend portion

: lateral wall

, 55 : middle wall

, 57: lateral wall

, 59: flange

, 62 : inner ridge line, 64, 65, 66: outer ridge line: notch

a: tilt part (first tilt part) : joint seating surface, 76: reinforcement member: harness

: partition space

Claims

1 . A vehicle body floor structure, comprising:

side sills;

a floor panel having a side end part that is aligned at a lower wall of the side sill; and

a floor cross member that extends in a vehicle width direction between lateral walls of the side sills, wherein

the floor cross member has an upper part having a top wall that is aligned at an upper wall of the side sill and a lower part that is joined to the floor panel,

the lower part has a notch adjacent to the side sill,

the floor panel has a depressed part adjacent to the side sill, and

a partition space through which a harness passes is formed by the notch, the depressed part, and the lateral wall of the side sill.

2. The vehicle body floor structure according to Claim 1, wherein the floor cross member has a step profile including a frontward step and a rearward step, and

the step profile has at least one outer ridge line and at least one inner ridge line.

3. The vehicle body floor structure according to Claim 1 or 2, wherein the upper part of the floor cross member has an overhang portion that is joined to the upper wall of the side sill and a bend portion that is joined to the lateral wall of the side sill, and

at least part of the overhang portion and the bend portion is formed so as to continue to a step part in the step profile.

4. The vehicle body floor structure according to any one of Claims 1 to 3, wherein

the notch of the floor cross member has a first tilt part,

the depressed part of the floor panel has a second tilt part, and

the first tilt part and the second tilt part are provided such that an interval between the first tilt part and the second tilt part increases toward an outside in the vehicle width direction.

5. The vehicle body floor structure according to any one of Claims 1 to 4, wherein

the floor panel has a tunnel part that extends in a front-to-rear direction at a center position in the vehicle width direction, and

the floor cross member includes reinforcement members that are arranged inside the tunnel part and extend in the vehicle width direction.

6. The vehicle body floor structure according to any one of Claims 1 to 5, wherein

the floor panel has bead-shaped ribs that protrude upward, and

the floor cross member is joined to the floor panel at least at the bead-shaped ribs.

7. The vehicle body floor structure according to Claim 6, wherein the floor cross member has joint seating surfaces that protrude toward the floor panel.

8. The vehicle body floor structure according to any one of Claims 1 to 7, wherein

the side sill has, as a joint part with a center pillar, a first joint part in the upper wall, a second joint part in the lateral wall, and a corner part provided between the first joint part and the second joint part, and

the first joint part, the corner part, and the second joint part are continuously provided.

9. The vehicle body floor structure according to any one of Claims 1 to 8, further comprising

side sill extensions and tunnel part extensions, wherein

the side sill extensions, the tunnel part extensions, and the floor cross member form triangular frame structures each of which having a substantially triangular shape.